Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40d2363fb60c1c1d2461a944c033e83528b19cfc45f7d4b01fb4c878e6b14c2a' 
  AND token = 'mrSp8cgSR6tEhPiRLLkh3Cdfeb3VFNoB6I54MbbL/hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}